Two issues:

1. The clutter-gst-1.0.vapi file is named incorrectly and should be called clutter-gst-0.10.vapi

2. The VideoSink class in the vapi should be updated to look like this:
	public class VideoSink : Gst.BaseSink {
		[CCode (type = "GstElement*", has_construct_function = false)]
		public VideoSink (Clutter.Texture texture);
		[NoAccessorMethod]
		public Clutter.Texture texture { get; set; }
		[NoAccessorMethod]
		public int update_priority { get; set; }
	}


I have verified that clutter-gst basically works with these changes.